James mcartiiur



(No Model.)

J. MGARTHUR.

SASH BALANCE.

Patented Nov. 10, 1891.

UNITED STATES PATENT OFFICE.

JAMES MOARTIIUR, OF ROCHESTER, NEW YORK, ASSIGNOR TO THE PULLMAN SASILBALANCE N COMPANY, OF SAME PLACE.

SASH-BALANCE.

SPECIFICATION forming part of Letters Patent N 0. 462,725, dated November 10, 1891.

Application filed November 28, 1890. Serial No. 372,970. (No model.)

To all whom it may concern.- with fiat projecting lugs J, Fig. 3, which fit Be it known that I, JAMES MCARTHUR, of corresponding notches in the cheeks and prethe city of Rochester, in the county of Monvent the axis from turning while sustaining roe, in the State of New York, have invented it in place. The inner end of the spring B is certain Improvements in Sash-Balances, of attached to the axisinside the drum by a pin which the following is a specification, referor lug, as indicated at a, Fig. l. The outer ence beinghad to theaccompanying drawings. end of the spring is secured to the circular My invention relates to certain improvewall of the drum by being bent and hooked mentsin spring sasl1-balances,having fortheir over the edge of a notch or opening therein, 10 object to render such devices simpler in 0011- as represented at Z), Fig. 1. The end of the struction and more durable in operation. tape or suspending-band D is secured to the My improvements are fully described and circular wall of the drum by being inserted illustrated in the following specification and through an opening therein and then being the accompanying drawings, and the novel passed outward through another opening, its [5 features specified in the claim annexed to extremity being held against the drum by the the said specification. innersurface of the first coil of the tape about In the accompanying drawings, representthe drum, as represented at c, Fig. 2. The ing my improvements in sash-balances, Figdrum is made in two parts, the one being a ure 1 is a longitudinal section on the line 1 l, circular plate fitting the axis, so as to revolve '20 Fig. 2. Fig. 2 is a front or face View. Fig. thereon, and provided with a circular rim or 3 is a side elevation, a portion of the case be flange to which the spring and tape are ating broken away, so as to show the drum. tached. The other part of the drum consists Fig. 4 is a transverse section through the of a circular plate having notches, into which brake, showing the manner of attaching it to the projecting portions M, Fig. 3, of the cir- 25 the brake-strap. cular flange project, so as to cause the two My improvements relate to sash-balances of parts of the drum to revolve together on the the type in which the sash is supported by axis. The plates of the drum are provided tapes wound about spring-drums, which are with a projecting ring P, Fig. 3, surrounding provided with brakes, by which thepower of the axis. The outer end of the suspending- 0 the springs is adjusted within certain limits band D is attached to the sash by a staple or 8a to the size or weight of the sash. other suitable device.

In the accompanying drawings, A repre- The brake E is supported by the brakesents the face-plate of an improved sash-balstrap L, which is approximately semicircular ance embodying my invention; B, the spring; in form, being attached at one end to the wall 35 G, the drum; D, the tape or sash-suspending N, Fig. 1, connecting the cheeks H H, by band; E, the brake, and F the spring which means of the hook (Z, and at the other end regulates the tension of the brake. being adj ustably secured to the face-plate by The whole device is designed to be let into the screw G, nut 0, and'spring F. The openthe side of the window-casing with the faceing Q is formed inthe face-plate A opposite 40 plate flush with the surface thereof, while the the hook, by which arrangement I am enabled o tension of the brake may be regulated from .to cast the hook d in one piece with the plate the outside without removing the balance by and cheeks without using a core. The partmeans of the screw G. ing line of the sand comes on the outer edge My improved sash-balances are designed to of the hook, the sand of the cope projecting 45 be used in pairs, one on each side of the wininward through the opening Q. In this way dow. I am enabled to reduce the cost of construc- The face-plate A is provided on its opposite tion. At the other end of the brake-strap the edges with the inwardly-projecting cheeks H screw G passes through an opening R in the II, which sustain the spindle or aXisI of the outwardly-bent portion S of the strap. The 50 drum. The spindle is provided 011 its ends nut 0 slides along the straight portion T of Ice the strap when the screw is turned. At its extremity the strap is given another sharp bend, as shown at U, Fig. 1, and the screw passes through an openingin this part of the strap also. By this arrangement the screw and the strap mutually support each other, and the strap guides the nut and prevents its turning with the screw, While the construe tion is exceedingly cheap, very durable, and capable of being put together by unskilled labor. The opening in the face-plate for the screw is also cast, so that the construction of my improved sash-balance requires no lathe- Work or drilling.

The brake E consists of a piece or pad of felt. or other suitable material arranged on the inside of the brake-strap and having its side edges projecting through longitudinal slitsV V punched or cut through the brake-strap along its edges. This manner of attaching the brake or friction-pad to the strap is very simple and efiicient, the edges of the slits in the strap holding the brake firmly in place.

I do not claim herein anything shown or described in my prior patent, No. 354,162, dated December 14, 1886.

In Patent No. 429,941, heretofore granted 'me, is described a brake-pad applied to a strap by narrow transverse projections form ed on its ends, held against teeth formed in said strap by spring-tongues. Said projections are partially cut by the teeth. They also have their smallest dimensions in the line of the strain upon the brake and their largest dimension is considerably less than the width of the strap. My present improvement dispenses with the teeth and provides that each edge of the brake-pad through its whole extent shall be passed through slits 111 the strap, these edges resisting the strain on the pad in their largest dimension, which is equal to the largest dimension of the pad. in said patent is described abrakestrap secured at one end by being bent around a fixed pin. In the present construction I provide a hook and a strap adapted to be readily sl pped thereon without the necessity of using a tool, and I provide an opening in the face-plate which facilitates the manufacture.

I claim The combination, in a sash-balance, of the cast frame consisting of the face-plate A, having opening Q, the drum-supporting cheeks H H, and the transverse wall N, having hook d integral therewith, and the spring-drum O, tape or suspending-band D, and a brake-strap carrying a brake and partially surrounding the drum and attached to the frame at one end by the hook d and at the other bya spring and an adj usting-screw, said strap being provided with an opening to engage said hook, whereby it may be connected and disconnected without the use of a tool, substantially as described.

JAMES MOARTHUR.

Witnesses:

Gno. B. SELDEN, A. SORGE, J r. 

